The LED indicator shows a battery error icon, and the vacuum refuses to charge or run.

Safety: Do not attempt to jump-start or open the battery pack. Severe injury or fire can result.

• Step 1 – Confirm the original battery: Check that the installed battery is a genuine or fully compatible Neato pack with the correct voltage and connector type.
• Step 2 – Long charge attempt: Place the vacuum on the charger and leave it connected for at least 3–4 hours, even if the charge light does not immediately come on. Some BMS circuits need time to recover from deep discharge.
• Step 3 – Reseat the battery: Remove the battery, wait 1–2 minutes, then reinstall it firmly. This can reset some BMS modules.
• Step 4 – Try an alternate charger: If available, test with another compatible Neato charger to rule out low charge voltage.
• Step 5 – Replace the battery: If the error persists and the vacuum will not run even briefly, the battery pack is likely locked out or damaged internally. Replace the entire battery pack and recycle the old one properly.